Validation of the Italian version of the Multiple Sclerosis Intimacy and Sexuality Questionnaire-19

Background: People with multiple sclerosis (MS) may experience sexual dysfunction throughout the disease course. Validated scales to assess sexual dysfunction in MS for Italian patients are lacking. Hence, we aimed at validating Multiple Sclerosis Intimacy and Sexuality Questionnaire (MSISQ-19) for Italian MS patients. Methods: We included both male and female MS patients. Each patient completed the Italian translation of the MSISQ-19. Construct validity was explored by the exploratory factor analysis and the Cronbach’s alpha coefficient. Test-retest stability and concurrent internal and external validity were examined by Pearson’ correlation coefficients. Results: We enrolled 369 MS patients (323 female and 46 male). Italian MSISQ-19 showed a Cronbach’s alpha of 0.92. MSISQ-19 test and retest total scores correlated between each other (r = 0.48, p = 0.01). MSISQ-19 total score also correlated with primary, secondary and tertiary subscales (p < 0.001). Conclusion: The Italian Version of the MSISQ-19 showed satisfactory internal consistency and reliability with moderately adequate test-retest reproducibility, suggesting that it may be used as a valuable measure of sexual dysfunction in the Italian population.